Table 7-5: Montana Air Quality Nonattainment Areas for Carbon Monoxide (CO),,,,,,
County,Area,Nonattainment in year,Redesignation to attainment,Classification,Part or whole county,Population (2000)
Cascade,Great Falls,95 96 97 98 99 00 01  ,NA,  Not classified  ,Part,"56,885"
Missoula,Missoula,95 96 97 98 99 00 01  ,NA,  Moderate <= 12.7ppm  ,Part,"52,356"
Yellowstone ,Billings,95 96 97 98 99 00 01  ,NA,  Not classified  ,Part,"91,232"
KEY: NA = not applicable; ppm = parts per million.,,,,,,
NOTES: Nonattainment areas do not meet the national primary or secondary ambient air quality standard for the specified pollutant.  Nonattainment areas are classified based on design values:  Serious = an area with a design value of 16.5 ppm and above; Moderate = an area with a design value of 9.1 up to 16.4 ppm.  ,,,,,,
"SOURCE: U.S. Environmental Protection Agency, Green Book, available at http://www.epa.gov/oar/oaqps/greenbk/anay.html as of Apr. 20, 2002.",,,,,,
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